Plants 0.8--1.5 m tall. Leaf sheath green, longitudinally striate; ligule 2-cleft, 3--4 mm, membranous; petiole absent on proximal leaves, 1--3 cm on distal ones; leaf blade narrowly elliptic-lanceolate, 25--55 × 4--5 cm, glabrous, base cuneate, apex acuminate or caudate. Spikes subovoid, ca. 4.5 × 3 cm; bracts reddish, subovate, ca. 3.5 × 2 cm, apex obtuse; bracteoles white, tubular, ca. 3 cm, apex entire. Calyx ca. 3.5 cm, split to middle on 1 side, apex 3-toothed. Corolla tube ca. 3 cm; lobes lanceolate, central one ca. 3.3 × 1.1 cm, apex apiculate, lateral ones narrower. Lateral staminodes red at base, white distally, subulate. Labellum broadly ovate, ca. 3.5 × 2.8 cm, margin crisped. Filament ca. 1 cm; anther ca. 1.5 cm; connective appendage 3-lobed, ca. 3 mm × 1.2 cm. Ovary greenish, glabrous. Capsule globose, 1.5--2 cm in diam., crisped winged. Fl. May.
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